After destroying the Fifth Spire and stopping the evil Lady Enix, Monty and her companions have returned to the City of Parn to save the blue nymph, Nadalia. In their search, they discover a vile imperial scheme wrongfully persecuting elves. To stop the empire and rescue the kidnapped Nadalia, Calais follows the dark machinations to the emperor himself while Monty considers an unholy alliance with the terrifying leader of the corrupted.

Meanwhile, Caellan and his brother return to their home, Castle Pellandarr, only to learn that his people are under siege by an oppressive bandit king and a mysterious tower wizard. As these forces destroy entire villages, he embarks on a quest to return peace to the barony but discovers the existence of a dragon artifact buried deep within the castle itself. As war consumes the realm, Caellan knows that such an object would create an unstoppable tyrant and must do whatever it takes to keep it from falling into the wrong hands -- no matter the cost.

Terror of the Sixth Spire is an epic fantasy, fast-paced adventure novel. It is the second book of the Fallen Spires series.